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Quantitative radiology

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https://www.readbyqxmd.com/read/28196280/cuda-based-acceleration-and-bpn-assisted-automation-of-bilateral-filtering-for-brain-mr-image-restoration
#1
Herng-Hua Chang, Yu-Ning Chang
PURPOSE: Bilateral filters have been substantially exploited in numerous magnetic resonance (MR) image restoration applications for decades. Due to the deficiency of theoretical basis on the filter parameter setting, empirical manipulation with fixed values and noise variance related adjustments has generally been employed. The outcome of these strategies is usually sensitive to the variation of the brain structures and not all the three parameter values are optimal. This article is in an attempt to investigate the optimal setting of the bilateral filter, from which an accelerated and automated restoration framework is developed...
February 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28186452/magnetic-resonance-imaging-characteristics-and-the-prediction-of-outcome-of-vestibular-schwannomas-following-gamma-knife-radiosurgery
#2
Chih-Chun Wu, Wan-Yuo Guo, Wen-Yuh Chung, Hisu-Mei Wu, Chung-Jung Lin, Cheng-Chia Lee, Kang-Du Liu, Huai-Che Yang
OBJECTIVE Gamma Knife surgery (GKS) is a promising treatment modality for patients with vestibular schwannomas (VSs), but a small percentage of patients have persistent postradiosurgical tumor growth. The aim of this study was to determine the clinical and quantitative MRI features of VS as predictors of long-term tumor control after GKS. METHODS The authors performed a retrospective study of all patients with VS treated with GKS using the Leksell Gamma Knife Unit between 2005 and 2013 at their institution...
February 10, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28168586/they-tamed-the-photon-early-days-of-radiation-dosimetry
#3
John R Patterson
This article is a tribute to the many physicists who tamed the photon in the service of mankind. Many received Nobel Prizes and other high awards. Several have units named after them. Some invented the equipment we use. Some sacrificed their lives before the hazards and benefits of radiation were fully understood. I discuss the progress over 120 years, both theoretical and technical, in the development of radiation protection regulations based on quantitative measurements and a consistent set of units, the gray and sievert...
February 6, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28159386/predictive-factors-for-resorption-of-teeth-adjacent-to-impacted-maxillary-canines
#4
Fany Cuminetti, François Boutin, Laure Frapier
PURPOSE: The aim of this study was to assess the link between the degree of resorption of teeth adjacent to an impacted maxillary canine and the situation of the latter so as to identify factors predictive of resorption. MATERIAL AND METHODS: This was a retrospective study concerning all patients with impacted maxillary canines who consulted the orthodontics department at the Center for dental care, teaching and research (CSERD) in Montpellier between 2010 and 2015, with a full radiological file including panorex, periapical long-cone and cone-beam images...
January 31, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28158903/tympanomastoid-cholesterol-granulomas-immunohistochemical-evaluation-of-angiogenesis
#5
Giannicola Iannella, Cira Di Gioia, Raffaella Carletti, Giuseppe Magliulo
OBJECTIVES/HYPOTHESIS: This study investigates the immunohistochemical expression of vascular endothelial growth factor (VEGF) and CD34 in patients treated for middle ear and mastoid cholesterol granulomas to evaluate the angiogenesis and vascularization of this type of lesion. A correlation between the immunohistochemical data and the radiological and intraoperative evidence of temporal bone marrow invasion and blood source connection was performed to validate this hypothesis. STUDY DESIGN: Retrospective study...
February 3, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28157404/whole-slide-imaging-for-analytical-anatomic-pathology-and-telepathology-practical-applications-today-promises-and-perils
#6
Alton Brad Farris, Cynthia Cohen, Thomas E Rogers, Geoffrey H Smith
Whole slide imaging (WSI) offers a convenient, tractable platform for measuring features of routine and special-stain histology or in immunohistochemistry staining by using digital image analysis (IA). We now routinely use IA for quantitative and qualitative analysis of theranostic markers such as human epidermal growth factor 2 (HER2/neu), estrogen and progesterone receptors, and Ki-67. Quantitative IA requires extensive validation, however, and may not always be the best approach, with pancreatic neuroendocrine tumors being one example in which a semiautomated approach may be preferable for patient care...
February 3, 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/28152963/kaiser-permanente-georgia-colon-cancer-care-through-the-science-of-performance-improvement
#7
(no author information available yet)
: 250 Background: While our patients reported high satisfaction with the care they received, Kaiser Permanente Georgia's baseline assessment found variation in the way our colon cancer patients were diagnosed and received care. This variation also effects the cycle time from diagnosis to initiation of treatment (surgery or first infusion). METHODS: Using Kaiser Permanente's Performance Improvement methodology and interdisciplinary cooperation, this project launched in January of 2014...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28150579/clinical-significance-of-the-radiological-severity-score-in-mycobacterium-avium-complex-lung-disease-patients
#8
K Furuuchi, A Ito, T Hashimoto, S Kumagai, T Ishida
<h2>SETTING:</h2><p>Practical methods for assessing the radiographic findings of Mycobacterium avium complex lung disease (MAC-LD) have not been established.</p><h2>OBJECTIVE:</h2><p>To identify a correlation between the radiological score and semi-quantitative culture results of respiratory samples, and to assess the prognostic impact of this radiological score in MAC-LD patients.</p><h2>DESIGN:</h2><p>We retrospectively studied 218 MAC-LD patients...
January 26, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28149958/radiomics-of-lung-nodules-a-multi-institutional-study-of-robustness-and-agreement-of-quantitative-imaging-features
#9
Jayashree Kalpathy-Cramer, Artem Mamomov, Binsheng Zhao, Lin Lu, Dmitry Cherezov, Sandy Napel, Sebastian Echegaray, Daniel Rubin, Michael McNitt-Gray, Pechin Lo, Jessica C Sieren, Johanna Uthoff, Samantha K N Dilger, Brandan Driscoll, Ivan Yeung, Lubomir Hadjiiski, Kenny Cha, Yoganand Balagurunathan, Robert Gillies, Dmitry Goldgof
Radiomics is to provide quantitative descriptors of normal and abnormal tissues during classification and prediction tasks in radiology and oncology. Quantitative Imaging Network members are developing radiomic "feature" sets to characterize tumors, in general, the size, shape, texture, intensity, margin, and other aspects of the imaging features of nodules and lesions. Efforts are ongoing for developing an ontology to describe radiomic features for lung nodules, with the main classes consisting of size, local and global shape descriptors, margin, intensity, and texture-based features, which are based on wavelets, Laplacian of Gaussians, Law's features, gray-level co-occurrence matrices, and run-length features...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28149758/defining-the-endpoints-how-to-measure-the-efficacy-of-drugs-that-are-active-against-central-nervous-system-metastases
#10
REVIEW
Alessandra Fabi, Antonello Vidiri
Brain metastases (BMs) are the most common cause of malignant central nervous system (CNS) tumors in adults. In the recent past, patients with BMs were excluded from clinical trials, but now, with the advent of new biological and immunological drugs, their inclusion is more common. In the last era response and progression criteria used across clinical trials have defined the importance to consider not only measurement changes of brain lesions but also the modification of parameters related to the metastases such as metabolism of tissue and its pathological features...
December 2016: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28140377/optimization-of-propagation-based-x-ray-phase-contrast-tomography-for-breast-cancer-imaging
#11
Patrycja Baran, Serena Pacile, Yakov Nesterets, Sheridan Mayo, Christian Dullin, Diego Dreossi, Fulvia Arfelli, Darren Thompson, Darren Lockie, Mikkaela McCormack, Seyedamir Taba, Francesco Brun, Maurizio Pinamonti, Carolyn Nickson, Christopher Hall, Matthew Dimmock, Fabrizio Zanconati, Marian Cholewa, Harry Quiney, Patrick Brennan, Giuliana Tromba, Tim E Gureyev
The aim of this study was to optimise the experimental protocol and data analysis for in-vivo breast cancer X-ray imaging. Results are presented of the experiment at the SYRMEP beamline of Elettra Synchrotron using the propagation-based phase-contrast mammographic tomography method, which incorporates not only absorption, but also X-ray phase information. In this study the images of breast tissue samples, of a size corresponding to a full human breast, with radiologically acceptable X-ray doses were obtained, and the degree of improvement of the image quality (from the diagnostic point of view) achievable using propagation-based phase-contrast image acquisition protocols with proper incorporation of X-ray phase retrieval into the reconstruction pipeline was investigated...
January 31, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28134027/radiological-impact-assessment-to-the-environment-due-to-waste-from-disposal-of-porcelain
#12
Tarek Morsi, Rehab Hegazy, Wael Badawy
The present study aims to assess the radiological parameters from gamma rays due to the uncontrolled disposal of porcelain waste to the environment. Qualitative and quantitative identification of radionuclides in the investigated samples was carried out by means of High-Purity Germanium (HPGe) detector. The average activity concentrations of the local porcelain samples were measured as 208.28 Bq/kg for (226)Ra, 125.73 Bq/kg for (238)U, 84.94 Bq/kg for (232)Th and 1033.61 Bq/kg for (40)K, respectively...
January 30, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28130583/a-case-of-porphyria-cutanea-tarda-of-the-liver-exhibiting-multifocal-macrovesicular-steatosis-in-the-background-of-microvesicular-steatosis-probably-caused-by-uneven-iron-accumulation
#13
Marie Nishiyama, Keiko Sakamoto, Yoshinobu Shinagawa, Ayako Morita, Hiroshi Urakawa, Ritsuko Fujimitsu, Hiroshi Shakado, Yoshihiro Hamada, Kengo Yoshimitsu
A 61-year-old man with chronic hepatitis B and a history of alcohol overconsumption was admitted to our hospital for the scrutiny of multiple echogenic liver nodules. CT and hepatobiliary phase of gadoxetate-enhanced MR imaging revealed no nodular lesions. Quantitative fat fraction images and R2* map of MR imaging suggested homogeneous steatosis and uneven iron deposition in the liver, namely moderately and severely elevated R2* values at the nodules and surrounding background liver, respectively. Biopsy specimens showed macrovesicular fatty liver and less iron deposition at the echogenic nodules, and microvesicular fatty change and more prominent iron deposition at the surrounding liver tissue...
January 27, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28129067/radiologic-pathologic-correlation-of-primary-and-secondary-cardiomyopathies-mr-imaging-and-histopathologic-findings-in-hearts-from-autopsy-and-transplantation
#14
Hiromi Hashimura, Fumiko Kimura, Hatsue Ishibashi-Ueda, Yoshiaki Morita, Masahiro Higashi, Shintaro Nakano, Atsushi Iguchi, Kensuke Uotani, Kazuro Sugimura, Hiroaki Naito
Cardiac magnetic resonance (MR) imaging with late gadolinium enhancement (LGE) is used to detect and assess the myocardial damage seen with a variety of cardiomyopathies. Gadolinium-based contrast material accumulates in the expanded interstitial space of the myocardium. Areas with LGE correspond to replacement fibrosis, fibrofatty change, epithelioid granuloma, inflammatory cell infiltration, cardiomyocyte necrosis, and amyloid deposition-conditions that represent a focal increase in interstitial space. Areas without LGE correspond to interstitial or plexiform fibrosis, mildly degenerated cardiomyocytes, inflammatory cell infiltration, and diffuse amyloid deposition-conditions that represent diffuse increases in interstitial space...
January 27, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28109700/a-low-energy-set-up-for-gamma-ray-spectrometry-of-norm-tailored-to-the-needs-of-a-secondary-smelting-facility
#15
G Lutter, I Vandael Schreurs, T Croymans, W Schroeyers, S Schreurs, M Hult, G Marissens, H Stroh, F Tzika
A measurement station dedicated for quantitative radiological characterisation of naturally occurring radionuclides in a metallurgical company and based on gamma-ray spectrometry was developed. The station is intended for performing quality control of final non-ferrous metal products and for radiological checks of incoming materials. A low-background point-contact HPGe-detector was used and the signal was split in two branches to enable collecting simultaneously spectra with high amplification (for gamma-ray energies below 250keV) and low amplification...
December 27, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28109641/three-dimensional-airways-volumetric-analysis-before-and-after-fast-and-early-mandibular-osteodistraction
#16
Valerio Ramieri, Emanuela Basile, Giulio Bosco, Elena Caresta, Paola Papoff, Piero Cascone
PURPOSE: Newborns with Pierre Robin sequence (PRS) and syndromic micrognathia show microgenia and glossoptosis, which cause reduction of the airway and breathing difficulty from birth. Our goal is to analyze quantitative and qualitative volumetric changes before and after fast and early mandibular osteodistraction (FEMOD) and to compare radiological data. METHODS: The sample was composed of 4 patients, who satisfied inclusion criteria for completeness of data. Computed tomography pre- and post-operation were performed, then a volumetric assessment was made with Dolphin Imaging...
December 18, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28104509/morphometric-vertebral-fractures-in-breast-cancer-patients-treated-with-adjuvant-aromatase-inhibitor-therapy-a-cross-sectional-study
#17
Rebecca Pedersini, Sara Monteverdi, Gherardo Mazziotti, Vito Amoroso, Elisa Roca, Filippo Maffezzoni, Lucia Vassalli, Filippo Rodella, Anna Maria Formenti, Stefano Frara, Roberto Maroldi, Alfredo Berruti, Edda Simoncini, Andrea Giustina
BACKGROUND: The impact of long-term adjuvant therapy with aromatase inhibitors (AIs) on vertebral fracture (VF) risk is still unclear. OBJECTIVE: In this cross-sectional study, we explored the prevalence and determinants of VFs in breast cancer (BC) patients before and during AI therapy. Each woman underwent a dual-energy X-ray absorptiometry (DXA) to evaluate bone mineral density (BMD) and identify VFs by a quantitative morphometric approach. Blood samples were collected to measure serum hormone and calcium levels...
January 16, 2017: Bone
https://www.readbyqxmd.com/read/28100932/defecography-by-digital-radiography-experience-in-clinical-practice
#18
Amanda Nogueira de Sá Gonçalves, Marco Aurélio Sousa Sala, Rodrigo Ciotola Bruno, José Alberto Cunha Xavier, João Mauricio Canavezi Indiani, Marcelo Fontalvo Martin, Paulo Maurício Chagas Bruno, Marcelo Souto Nacif
OBJECTIVE: The objective of this study was to profile patients who undergo defecography, by age and gender, as well as to describe the main imaging and diagnostic findings in this population. MATERIALS AND METHODS: This was a retrospective, descriptive study of 39 patients, conducted between January 2012 and February 2014. The patients were evaluated in terms of age, gender, and diagnosis. They were stratified by age, and continuous variables are expressed as mean ± standard deviation...
November 2016: Radiologia Brasileira
https://www.readbyqxmd.com/read/28094893/a-comparison-of-skeletal-maturity-assessed-by-radiological-and-ultrasonic-methods
#19
Katinka Utczas, Agota Muzsnai, Noel Cameron, Annamaria Zsakai, Eva B Bodzsar
OBJECTIVES: The estimation of skeletal maturity is a useful tool in pediatric practice to determine the degree of delay or advancement in growth disorders and the effectiveness of treatment in conditions that influence linear growth. Skeletal maturity of children is commonly assessed using either Greulich-Pyle (GP) or Tanner-Whitehouse methods (TW2 and TW3). However, a less invasive ultrasonic method, that does not use ionizing radiation, has been suggested for use in epidemiological studies of skeletal maturity...
January 17, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28090450/quantitative-magnetic-resonance-imaging-of-the-lumbar-intervertebral-discs
#20
REVIEW
Dosik Hwang, Sewon Kim, Nirusha A Abeydeera, Sheronda Statum, Koichi Masuda, Christine B Chung, Palanan Siriwanarangsun, Won C Bae
Human lumbar spine is composed of multiple tissue components that serve to provide structural stability and proper nutrition. Conventional magnetic resonance (MR) imaging techniques have been useful for evaluation of IVD, but inadequate at imaging the discovertebral junction and ligamentous tissues due primarily to their short T2 nature. Ultrashort time to echo (UTE) MR techniques acquire sufficient MR signal from these short T2 tissues, thereby allowing direct and quantitative evaluation. This article discusses the anatomy of the lumbar spine, MR techniques available for morphologic and quantitative MR evaluation of long and short T2 tissues of the lumbar spine, considerations for T2 relaxation modeling and fitting, and existing and new techniques for spine image post-processing, focusing on segmentation...
December 2016: Quantitative Imaging in Medicine and Surgery
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